Storage Seeker is the first Google Map mashup I've seen that can help you find storage facilities. Moreover it has a number of very nice features.
To find storage facilities the user sets their location. Storage Seeker then displays on a map all the facilities within five miles of the location. The first cool feature of this map is that the facilities are listed in the sidebar in order of proximity to the set location. So you will find the facility nearest to you at the top of the list.
The second really cool feature is that the storage facilities that you select in the sidebar are then given a different colour marker. The user can therefore see very easily which facilities have been chosen so far.
Storage Seeker hopes in the future to also be a comparison website so that users can not only find the nearest storage facilities but also compare unit prices and access to the facilities.